Incorrect timestamp when unzipping universal apk

**Describe the bug**
When using command `bundletool.jar build-apks` the output zip, containing the apk, will provide an apk with the timestamp set in 1981.

**Bundletool version(s) affected**
Version: All

**Stacktrace**
Copy all of the output of the command, including the stacktrace if visible.

**To Reproduce**
* Run
```
java -jar ./bundletool.jar build-apks --bundle="./resources/example.aab" --output="./bundletool_temp/output.apks" --mode=universal
```
* Extrack the universal apk
* Check timestamp

**Expected behavior**
Expected to have at current date or at least the date the aab was created.

**Known workaround**
You can use `touch` command to update the Modified date.